The machine is a Colchester storm a90. It has been sitting since it was bought used. I manage to get it making parts now.
I am making pulleys and all is well except for smallest profile, which is where the bearings are pressed into.
What is happening is that the rough pass bores oversize only on that profile, again for the smoothing pass then it 'cuts' to size for the finish. everything cleans up except that bearing bore which can be oversized. If i change the second U value that bore dimension deviates more as I increase U.
I have tried g41, g40, tool nose 0, 2, 3 for a left hand bore bar. TNR .032"
This is the second part with a bore profile where this has happened.
These controllers aren't the most intuitive. lol. Am I misunderstanding something, coding wrong?
Here is the code:
Code:
T0303;
S600 M4;
G00 X.93;
Z.15;
G71 U.025;
G71 G41 P210 Q280 U.015 W.002 F.005;
N210 G01 X8.1;
N215 X8.054 Z0;
N220 X7.572 Z-.051;
N230 G02 X7,338 Z-.174 K-.022 I.062 R.15;
N240 G01 X7.09 Z-.958
N250 G03 X6.25 Z-1.317 R.425 K.066 I.42;
N260 X2,138 C.065
N270 Z1.88;
N280 X.93;
G70 P210 Q280 F.002;
G00 Z8;
M30;
N260 seems to be the problem bit.
Thanks